芦苇乙醇制浆蒸煮废液蒸馏残余物脱色及其糖分分离技术研究
发布时间：2018-04-24 07:53
本文选题：芦苇乙醇制浆 + 蒸馏残余物 ； 参考：《大连工业大学》2015年硕士论文
【摘要】：制浆蒸煮黑液中的降解糖含量丰富,对其中的降解糖进行提取与纯化,可以达到既能够减少废液污染,又能获取社会效益和经济效益的目的。目前很少有对制浆废液中的降解糖进行回收和分离的系统研究,本研究针对芦苇乙醇制浆的特点,试图对芦苇乙醇逆流法制浆废液的蒸馏残余物进行脱色,从而得到混合的降解糖,进而为芦苇制浆蒸煮废液中降解的碳水化合物回收及综合利用提供理论依据。主要的研究内容和结果如下:首先是芦苇乙醇制浆蒸煮废液蒸馏残余物研究。通过减压蒸馏和真空干燥收集芦苇乙醇制浆蒸煮废液蒸馏残余物,利用离子色谱检测其中的降解糖总含量高达54.38%,木糖含量为38.60%,而且木糖为总糖含量的70.98%,另外还有少量的Gal(半乳糖)、Glu(葡萄糖)和Ara(阿拉伯糖)。并且进行了红外光谱分析和热重分析得出结论蒸馏残余物主要为木素和降解糖的混合物。其次是芦苇乙醇制浆蒸煮废液蒸馏残余物脱色方法初步研究。以脱色率以及降解糖保留率为考察指标,探讨芦苇乙醇制浆蒸煮废液蒸馏残余物脱色,蒸馏残留物脱色率可采用紫外分光光度计法检测,经过分析可知脱色率的最佳检测波长是282nm。树脂、氧化钙、活性炭和硅藻土四种吸附脱色方法中,D285大孔强碱苯乙烯系阴离子交换树脂脱色效果最佳,色素的吸附过程完全遵循Freundlich方程。再次是芦苇乙醇制浆蒸煮废液蒸馏残余物树脂脱色工艺参数优化研究。通过条件试验和正交试验,以静态脱色工艺参数为基础,探索D285树脂用于芦苇乙醇制浆蒸煮废液蒸馏残余物动态脱色的工艺参数,获得最佳工艺参数,以期为芦苇乙醇制浆蒸煮废液中的降解碳水化合物回收提供实验基础。树脂静态脱色时,溶液pH值6.00,脱色时间时间2h,树脂用量0.04 gml-1,脱色温度30℃,脱色率为89.93%,总糖保留率为93.52%。D285树脂的动态脱色工艺时,溶液质量浓度为6.00mg/ml,上柱液pH值6.5,温度30℃,流速6ml/min(0.75BV/min),上样量4BV,串联3个树脂脱色层析柱,脱色率为98.04%,总降解糖保留率为85.58%。最后是芦苇乙醇制浆蒸煮废液蒸馏残余物脱色后所得样品研究。蒸馏残留物经过复溶、树脂脱色后,所得样品中总糖含量达到了90.18%,其中木糖含量占总重的69.79%,复溶、树脂脱色可以作为糖分分离手段。离子色谱法可以作为低聚木糖的定性、定量方法。经离子色谱法检测,蒸馏残余物经树脂脱色后,样品中木糖单糖的含量为7.94%,聚合度在2到6之间的木糖(D2-6木糖)总含量为27.83%,聚合度大于等于7的木糖(D≥7木糖)含量为34.02%,其中D2-6木糖占总木糖的39.88%,D≥7木糖占总木糖的48.75%。100g绝干芦苇原料,乙醇制浆蒸煮废液蒸馏残余物为7.15g,复溶脱色后剩余2.89g,其中木糖2.02g,D2-6木糖1.04g。
[Abstract]:The content of degraded sugar in the black liquor of pulping and cooking is rich. The extraction and purification of the degraded sugar can not only reduce the pollution of waste liquor, but also obtain social and economic benefits. There are few systematic studies on the recovery and separation of degraded sugar from pulping waste liquor. In this study, the distillation residue of Reed ethanol pulping waste liquor was decolorized according to the characteristics of Reed ethanol pulping. Thus, the mixed degradation sugar can be obtained, which provides a theoretical basis for the recovery and comprehensive utilization of carbohydrates degraded from Reed pulping and cooking waste liquor. The main research contents and results are as follows: firstly, the distillation residue of Reed ethanol pulping and cooking waste liquor is studied. The residue of Reed ethanol pulping waste liquor was collected by vacuum distillation and vacuum drying. The total content of degraded sugar was 54.38, xylose was 38.60, xylose was 70.98 percent of total sugar, and a small amount of Galal (glucose) and arabinose was detected by ion chromatography. Infrared spectroscopy and thermogravimetric analysis showed that the distillation residue was mainly a mixture of lignin and degraded sugar. Secondly, the method of decolorizing the waste liquor of Reed ethanol pulping was studied. The decolorization rate of waste liquor from Reed ethanol pulping and the decolorization rate of distilled residue can be determined by ultraviolet spectrophotometer. The optimum detection wavelength of decolorization rate is 282 nm. Among the four methods of adsorption and decolorization of resin, calcium oxide, activated carbon and diatomite, the decolorization effect of D285 macroporous strong alkali styrene anion exchange resin is the best, and the adsorption process of pigment follows Freundlich equation completely. Thirdly, the optimization of the technological parameters of the resin decolorization of Reed ethanol pulping waste liquor distilled residue resin was studied. Based on the static decolorization process parameters, the dynamic decolorization of waste distilled residue from Reed ethanol pulping was studied by condition test and orthogonal test, and the optimum process parameters were obtained. In order to provide experimental basis for the recovery of degraded carbohydrates from Reed ethanol pulping waste liquor. The solution pH value was 6.00, the decolorization time was 2 hours, the resin dosage was 0.04 g / ml-1, the decolorization temperature was 30 鈩，
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